PDF malware analysis — malicious · 797bec1bf43f12b0

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 05:34:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22

MD5: 985980b5007b3ba8af2fc209fd198371 SHA-1: 3f84b655b2e8529753467b292d398caec65341b8 SHA-256: 797bec1bf43f12b00452b4b3b1983cd82bfacd3a61c5f3456268bc693b969013

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 5

Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE

PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
External URI info PDF_URI

PDF contains an external URL action
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://netcdn.tw/app/431946152/free-credit-card-for-robux-game-hack PDF link annotation
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/coin-master-hack-apk-android-1_GM406889139.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/noclip-hack-for-prison-liferoblox_GM431946152.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/how-to-get-bloxburg-free-on-roblox_GM431946152.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/how-to-get-gamepasses-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/coin-master-root-hack_GM406889139.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/roblox-with-free-robux-apk_GM431946152.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/mcpe-optifine_GM479516143.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/how-to-get-lots-of-robux-free-2021_GM431946152.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/how-long-for-robux-hack-to-get_GM431946152.pdfIn PDF document text
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/free-400-spins-coins-master_GM406889139.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00003302.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3302	22116 bytes
SHA-256: `b26392c8f92cc77fa6ce351f7707be7d82f6ba795df76cd1552916cc8b298282`
`font_01_sfnt_off0000640d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x640D	18928 bytes
SHA-256: `e0e1ed2c79171fcdd255fe272b6e3c66916dce64d6d41cc971ba7e692d2e4877`

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